Highly Selective Perchlorate Membrane Electrode Based on Cobalt(III) Schiff Base as a Neutral Carrier

Abstract

A highly selective poly(vinyl chloride) (PVC) membrane electrode based on Co(III)-Schiff base [Co(5-NO 2 -Salen)(PBu 3 )]ClO 4 •H 2 O (where 5-NO 2 -SalenH＝bis(5-nitrosalycilaldehyde)ethylenediamine) as a new carrier for construction of perchlorate-selective electrode by incorporating the membrane ingredients on the surface of a graphite electrodes has been reported. The proposed electrode possesses a very wide Nernestian potential linear range to perchlorate from 1.0×10 -6 to 5.0×10 -1 mol•L -1 with a slope of (59.4±0.9) mV per decade of perchlorate concentration with a low detection limit of 5.0×10 -7 mol•L -1 and good perchlorate selectivity over the wide variety of other anions. The developed electrode has an especially fast response (＜5 s) and a wide pH independent range (3.0-12.0) in comparison with recent reported electrodes and can be used for at least 2 months without any considerable divergence in their potential response. This electrode was used for the determination of perchlorate in river water, drinking water, sludgy water and human urine with satisfactory results without complicated and time consuming pretreatment.

Porphyrin based nano-sized imprinted polymer as an efficient modifier for the design of a potentiometric copper carbon paste electrode

“…over the studied temperature range with high thermal stability, so that the electrode was usable up to 45 C. The observed deviation from the Nernstian behavior of the sensors over the applied temperature may be attributed the change in the diffusion coefficient of the ion as well as possible bleeding of the paste components at high temperature. 39…”

“…The water samples including mineral water, tap water (from Yasouj University Lab) and Beshar river water (from Boyer-Ahmad location) were collected and prepared according to literature. 39,48 The results are illustrated in Table 4. The results (RSD% $ 1%, recovery ranges of 100.0-106.3%) reveal that the constructed sensor works well under laboratory conditions.…”

Modified carbon paste electrodes for Cu(II) determination

“…Application of ionselective electrodes (ISEs) continues to be an interesting area of analytical research as they provide accurate, rapid, non-destructive and low cost methods of analysis, fast response, and convenience. On the other hand, ISEs have easy handling and do not require sample pretreatment [11,[12][13][14][15][16]. A major obstacle encountered in monitoring dopamine (DA) with electrochemical methods in the real samples is the coexistence of high concentration of ascorbic acid (AA), which oxidizes at a potential close to that of DA at bare conventional electrodes.…”

Preparation of a new chromium(III) selective electrode based on 1-[(2-hydroxy ethyl) amino]-4-methyl-9H-thioxanthen-9-one as a neutral carrier

“…While chromium (III) is considered essential for mammals for the maintenance of glucose, lipid and protein metabolism, chromium (VI) is known to be toxic for humans [1]. Therefore, development of accurate and reliable method for determination of chromium ion is very important [2][3][4][5].…”